I found a used 13 x 19 Mercury prop but the outer housing had a chip in it. Will that cause any issues? Just looking for a spare prop for my 90 hp optimax.
Boats & Motors
Propeller condition
Looks like that would be fine for a spare. I don't bother getting props repaired anymore, I just buy new ones. As others have mentioned its around $75 to repair a prop and for my 50 hp merc i can buy a new prop for around $115 and have it in 2 days from amazon. I found repaired props don't last long and are weaker. Also looking at a 2 week turn around in most cases.
you could probably repair that chip with some JB Weld putty
That little ding on the rim of the exhaust hub will not affect anything, especially on a spare prop! The blades are what your concern is. That hub is close to the prop shaft (less affect on balance while spinning) and does not have any effect on the actual propulsion of the boat. A chip out of a blade is farther from the center of the prop shaft and when combined with the difference in surface area in contact with the water, the balance of the prop is thrown off due to metal missing on the blade AND the difference in surface area contacting the water. That little chip out of the hub will affect nothing.
You won't get optimal performance with it but it will push you forward. I've seen worse. That would be fine as a spare.
Edit: I was just looking at the blades. I re-read your post and so I'm not sure what issues the chip in the outer housing might cause. I don't think any, but I'm not the most mechanically inclined.